The CAE Analysis And Optimal Design Of Cam And Hemming Mechanisms Of Automotive Panel Die

At present, with the rapid development of automobile ind ustry, the development cycle of new vehicles has been continuously shortened. Therefore, higher requirements of the design speed of high quality automotive panel mold and the mould technology equipment level are put forward. In the automotive panel die, so me processes of automotive panel mold such as lateral forming, combine and hemming could be finished in one time in the premise of using the composite multi- faceted precision forming functional modules. The modules play important roles in reducing the numb er of moulds and production costs and improving product quality and production efficiency. How to design the reasonable forming function module and improve its reliability is one of the important subjects of automotive panel die design and manufacturing. Cam and hemming mechanisms are used as precise lateral forming functional components in automotive panel compound die, and the motion interference and structural stiffness problems of the two mechanisms have been researched in this paper.First of all, the solution to increase limit blocks has been put forward after analyzing the interference phenomenon of the inclined ramp drive block and wedge slide of cam mechanism prone in motion through the motion simulation analysis with UG software. To solve the unstable problem of the inclined cam mechanism in motion, V-shaped guide surface structure is used in the connection between its slider and wedge. The result shows that the accuracy of the guide and the stability of the guidance force have been improved. Optimization suggestions on the size of double action hemming mechanism has been put forward to eliminate the movement interference between the driver and the triangle swing block and the movement interference between the base and the tail of the triangle swing block.Secondly, the effects of stress and deformation on the precision of the precision lateral forming functional components of cam and hemming mechanisms in working have been mastered through computer simulation analysis of the rigidity of the cam mecha nism and hemming mechanism with ANSYS software. The V-shaped guide of cam mechanism has been optimized and the stress of the connection between the guide and the cam slider has been reduced.Finally, the new type of double drive double slide rail composite hemming mechanism has been researched. In the pressing, the requirement of large folding work space exists in the application of ordinary package machine because of extra width and large complex surface. In addition, the weak synchronization when multiple sets of ordinary package edge are used also exists. The results of this paper have solved the above problems. The conditions of connection among the new hemming mechanism parts have been examined through motion simulation. The interference between the pre-compression driver and the swing body has been eliminated by increasing the distance between the end face of preload driving cam block and the end face of return block. Through the stiffness numerical simulation, the load situation of the new hemming mechanism in the working process has been tested, and the strength and stiffness of the body parts have been improved by optimizing the size of sliding frame and the connecting rods.